A train runs at a constant speed of 15m/s for 30seconds and then accelerates uniformly to a speed of 35m/s over a certain period. The train comes to a stop in 25seconds. If the train travels a total distance of 1200m then: draw the velocity time graph of the motion

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions